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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbfd25ec7f9dee14c3ea37204555e378348a6681263b3a09b107829d8da1773d' 
  AND token = 'vfp9LT5Y9pNJdM7ny9x41day33bqPuOhh/kYTGTL8IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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