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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b9a7b1d4aeadbea7293f6f9385bed5a996c2538f47c3c8558bf458d3806a9cd' 
  AND token = 'tI0idKzJ1d0lD8QlV3ydT9TFBnzqyA5piA9MFOdp8VI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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