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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffed0cefb48fbd58a099a6d438c88cedd1d5acd6dc0ba820812e62dbe4e345ba' 
  AND token = 'yftLe9dMTd31b0eDCHjC+XxB+bcA+FAHQLwvGNkTN/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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