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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '203d483a3c5a26c1d82e4ada863e6fe9b0da70093e1d826c99f52834981898b7' 
  AND token = 'R4joTWIpNrGRGUBOF9vVW4cO2ZIye4t8J0NCUkYnVt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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