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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d6473ced6768fdf75eff7cc589367840ae392e4beb308e34eb1ce7a6901fcb' 
  AND token = 'aqL+Q9MOZCEKJ4nwJyxZD9IfKyU00q8z01sgHf2bcjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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