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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd46b7d987d3b117de1447a781b75f71c64959439ec314a4e939d2f4b5a2790f1' 
  AND token = 'nIz0vlTVwzbYfIIbs4aefKOi0j6J5pO75K9/O3XXpQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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