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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db6324f8cc8ca68572bd34d712cccaec612d65dadfbb4665d5c6c76c889bd358' 
  AND token = 'mWJxtq1U7xbfqNYDBMMsuCBb0dsCwt3MRCdq3FGtjkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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