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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5337a807121d802c7de656accf2f8926e0b2fa0ade57a880873bc0a9ad82292c' 
  AND token = 'B1IcvyGX+f3loaPV0zE8B3Xkjcjc7XNGzC9hog7lGMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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