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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a97bf4ba0d39f81e95d6dec6fa5f707b0e011c5564e478620b07eecb1580d1e1' 
  AND token = 'gQBCOy+9FQu+xQvS61ff8EvQB4Ijgkth0t1/UQ05518=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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