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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3150995e83e2d47e7bd9fc436c6a8bce91a49fd90410f913697901c6373a215b' 
  AND token = '9fLCR1yU2LJpnMAf5oDzF19Foqgyh8+j+a0oQAa04vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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