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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '263f533db8ec9cc0ccb52221ff8eb88f760b298657ff4ffb16c49e367e1765ec' 
  AND token = '05ILcrTUME2vydgFt88Q0tfmhdAz/IoyHMt2dAOtfJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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