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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c267b0247ea52729fe29d639cbf2afa424aaf3d390bbc41fcbd1a9bc754c77' 
  AND token = 'a5rs2k3rsCI2cKSbA3ghYrpvVT7kJY5q3wcrho2nv14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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