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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7837477c92180ecb2a9fe6a0cabc6533bfbb7e79f13ea2d04afe0c25e38f143' 
  AND token = 'duSmfZr2x6j0nOWhMg3IFTF9qQwkt/1gm4nuY3xBK5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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