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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cfc061fe646b98c16c421e05e3189c0f1574302bcb04cf4345b4a4219dbe009' 
  AND token = 'NU1HAkcFtPlxHstz5REqRUZSTbMFgNDt4NuhBGvIZI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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