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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d466ffbfecf374475a9c8f750fd4b978898592a00d8b211cdecd2e096ab3b1' 
  AND token = 'Ny9puwtH2IiGCrKYAsyorgnFhMNak6Zmhnc30gW7m8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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