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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb6dce1eab9d7d3513291b50778dbf2a0ca6d9b00c167dcaada3af7ee1278a6' 
  AND token = 'Rv7Ryfre0YHMFv+3BJlUuHWPaBWIQGjzXfn2pIOgnZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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