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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213ba781040aad95266be9d9eeb9d01776e002b88e0168ff6fefde8aa71c7bcd' 
  AND token = 'tP2ZmnAt9ZXFdUUrl1kb59czSBdlaCRXbLzDo+TD6Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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