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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dee2589ece6524afa699d68943fed686dbf18a219c604c8f8c260d2585b34ea' 
  AND token = 'h3fWY+xbFb68Mfp+WT0s9FWA094FzBW+Mp5NlxhO43I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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