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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12d9be5c1eaf2b2c9087c2be755279331d399e0e5a3d6b114ca2d577ef712e71' 
  AND token = 'nrrdSveXcPfP9FUAeSha/M7okwesy50catno9Lxexac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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