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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '268a122f687db6e3bab4f2567911580a89c135da6f64af8801b35483de3e0cbd' 
  AND token = 'r8pcWt88wn6/mnaXlXvbM24bP8DZ1dvR1do6ERm/RiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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