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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec186e127054af18e407c84a587e2997e241b134bd8ce70276a1467ffe064ae' 
  AND token = 'DWQCswi2+zGf8/tFz9okPouwsUhpD4Vp6rf1DrryHbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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