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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '535e710a16ca97230546a1d8a4bc6b756dc82ebad78597e454bb4de1cc42235c' 
  AND token = 'jl1cbVFzpUeFxBXMiEswRRmGCbpGgp71MDuAFN8CXqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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