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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a6d2ea21e4b7bab921331859b2d76ad0739c32ab5b30d83b0113b0483b610d1' 
  AND token = 'QBX/QUDjZ+ryuJ7cEVO+lISxOwh7B5FH22krZeBDQJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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