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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83dfce348ca1a1d6bb39620dd9bbb91f607ae56255b2de94ad70921a2972cb4' 
  AND token = 'L59tixH2ZaCICHOUCwEzBPVSb3mqzR4c9pGidP/V3kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}