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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '623dce1a225cf98622c34fac71585fc2ae536ce846aa536f4ec32f7d2af98477' 
  AND token = 'qJb3G1SsWT8XKRgxclfdK1Jw3PW+PUdZqxGRjRkULjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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