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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a69677b31e5fd35c4e36db5bb29012d4c7fb7f1b66172e5242e33291aa6dcbe' 
  AND token = 'CXC84ojm8og0tk8A6hpx5s9hmZsaiMEyZ5GL2sxatpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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