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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b5ed983c03ca8f97f9873c96112bca5d0dde118ce9cb71000f5ec70225a65a9' 
  AND token = 'e19BXgXy1jFHtJIyV1aBi8PH2izSHxZKbDg9RgLX8gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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