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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d4d9da7ee328f9205015764b6c74d8ff7ecf3aeecbc7b58b7ca2cbc8b93ebd' 
  AND token = '/blqfx7MqJ7PPOpOAxNZ2AjVFKX/HOz7u46pzmdXVEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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