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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af1836c819bbe22ca86a174f71928c7806ea6f404ffb784d9ef9d9dec2d105d5' 
  AND token = '+2QgbW5r65hYcV+SG7CKIt2R++QB5onxvWYDs5r7o6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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