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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e34b0fd03c832e8c773b6b47584c3c38165e530d7e911056ba41b7ad9952569' 
  AND token = 'ZkCKfLbu2n1f93wBcrkscjieh8WJtItnwWKRjah/Tmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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