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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767129fd5c3df9f3eb48a43def3e17d615d8057d8f98c7dfbc7297fefc28e746' 
  AND token = 'kY+/mF347/Ukz7bCRjNAvpK5oykBAMl3sCRCej9bq6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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