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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85e15dfead566dcce5a049a058953ce23e3dfbb32098ac043bba8e3d9a2f4b82' 
  AND token = 'hV06PrEvLbsU1JN+m3/DPkqXpelMw9d6xviB+Tv43uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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