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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67599043bced53956166bf2f58ebc3e1b0af9542290fd0c46bb835b3fafc8098' 
  AND token = 'buk6mPubY6d+MGH3gRATL87Nx+02Hafjqk8dd2cIjuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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