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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd791201027fa7ff90c88a34b144a9f2ae2ffc96956a9aa25640b2b4ee0cf8ad5' 
  AND token = 'OmRzuGZzAESETcCLvbkIdswRGSOTHg239j7/T4Q+nAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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