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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5d82d3b77623a149ca5e68e5cde550d07e8f633fe206390d55061028b8994bf' 
  AND token = '9pcDoV086XwD+CgSTdmBfUR5OU6CP5TQRBhOZHqUWTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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