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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1199c704624254cd8164807912e260af8fe8778adaa35c566de95d5732ff95df' 
  AND token = 'grxYv1o6/2mAHjNF+PMYZRbYoeLe42d+fFK8Y59HP4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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