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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aed94149a06c56b12ba4fe7b762b7a8c4d7f1f75d55a26ac589c21b106235e82' 
  AND token = 'bi3kl9pHFOzQ5advMgxWOrtaU/jzqckFCtNJVsMHkIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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