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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98e9f4c239be01106535e4e784d30f9c37b69f8fead2bda26e5b0480a6f47d5a' 
  AND token = 'w/O8DlJKcRat8KHctU1ByXpXUtRP0T5h9QFH67twoMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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