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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb6855921efac221dcc04e52c3ca0e185f419d1b61e92ad6aacfd3985cc6ac6' 
  AND token = 'e359bFbi8bqsm9ebEcL6mTNmQcyqzH7eDWXJzK3v8aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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