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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad66d47d12330629694c9f511721b4b48347f786fd989bc916abf1c61ddf3354' 
  AND token = 'L48MnLBXZQU7lcDqn4O9VRFZSfcNEe8N4J/PDw4owAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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