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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1417e6702c2c272306546ed371e484b0b31fc9feb1c5d5a7fbc206419d3f5f2f' 
  AND token = 'B0KPYfs0H44Z612ebUSPjAB7USjnsiSWVR7uFe4wMMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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