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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e970cde4a55f3d1be14407bdbbb0b3feeb9afa8e052349036f70e245b79f78e3' 
  AND token = 'sriQAhlvn2rfFyT5rFtVP9ZONUXsQ8mHVPKgS1dNbZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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