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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdad6477a3425b9041973465b800bff595aec50dd1fec696745ccfc34d93396f' 
  AND token = 'wrm1srA48XcPMkBUIeBS05QAi2mUIQV6OReP3F1J+Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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