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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e747f97b8f7501785b901eb8a6a69e3545c32c49ac87565c71f12cdb0f45aca8' 
  AND token = 'NSP+g3/lPab81S+U4KaNY45D656LRP94Opc65cLLJd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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