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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84967fb246c903896556b2a14be464ab641ed5c0aa557970d248b81674888e5' 
  AND token = 'nE+g06qZAiKB2c7W2cc7579Kx6f40fvWPOc5bWesNC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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