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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e72dbd07f8cbf6cece92ce759e8096451f5cc8e6b6d6902e570638c27ad4f412' 
  AND token = 'hlATxEufjfdP7iHJ9S8IjV+kwJXH4ARNDq+pN4mJwD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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