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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfb573fa4876ea29dcc07dd393b4cc4af243128e52aea20fac79b97122148f6a' 
  AND token = 'TP5y6T48ZdnIAM90zdUBF6VDGjSgiGt8ehJUOKfNC5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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