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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0e7a055dfa3361f1c85688bca2748e853b7ac65d28bae625c683245f43dd2ec' 
  AND token = 'o+gmzruqODKCV5Uu6xD6pmi+qTTd6A4ImEt8YxLvdAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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