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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c60ab6966440cdffe8b0052f9f8367e8daf38a72fdec164c60df26476b0f8cbf' 
  AND token = 'wcpikYayeXL+sm2l4u/INES0xne8x7MT+CuFMiEcoys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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