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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5329aeaf129baa04960d0e162300d9d4b7a2a676c4c4ed9c3a09fe12eedeb7f9' 
  AND token = 'SPSQcgMYKfcK/aO8yBx3GKzczwAsLS372J4piaQV85U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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