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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a8fd2a9e86464b36a49cbaedeae2d04899db10754664e595dca6e81cffd652' 
  AND token = 'Vqa6Ue5lkQlcJXCPP5dcaxfGdwIFp1Ih486c8fEN1p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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