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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0950ee6a44a572d478f6d85e20438d9ce99a21b7d83507713035ada027abd233' 
  AND token = 'kiIxqtdywiXP3lrau0UaD1BdZyBCaaNHW93g7oYu9k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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