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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bdf7eb19e3bd2e7a3e0f2b72f5aa9e6f489762d1b28bbc02cb2763d54aba8eb' 
  AND token = 'Q5mvh06AGXTAkOovYIyAB1B/tcM4FXe1EHVdoErd0qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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