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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc9cd581c571b4a1c7fbed695c08b716b76c9f9dcaf62d264a499eb20d543cb' 
  AND token = 'nT12NoMCYQNFd9+6GjbaH19nJUC9SRaBu85x3eLn5xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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