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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3beb753b9bf1306677238c2a5f8bd0bb47d4e01c17761ba80ad07ecc48b2937a' 
  AND token = '+7ehXZ5Ws8L7yYXyKPpjR6k55YOy4bWRcC98m3wzinw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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