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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d9f245b51f3913d452578db8f1108891af8631df281839a473719c862b6411' 
  AND token = '9ce11y3oCpr14xRDpoQyCTgcxGsNQdiZIZmlHjbZzjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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