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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c09ff2f5b5bc29a80cb7e05b03de54f995e4d747800cb09d6ca4a39e2a0487' 
  AND token = 'yTa2HiD3NM5Iwje3LYjGorQR673s0t10TyUu6LuwAo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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