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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7792019bc76587c65b6c8e9470ecc86fef986bd2c874dd82ad9bc54801dd0a87' 
  AND token = '2+8FsCN4+Gbcbv12SgeKGh8+T5c3zOi+/OD1KCm+ppk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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