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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2beeeddb0cd8762cd433ba9299c129926445e17e16297ac16c0f4a77650c25e' 
  AND token = 'AexvfbHQGBqjukmKTlp59lST8u1UQd2M9+Om3q2q4FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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