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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '691cd4a9582f7e707ce1faf89094e9275360c4c60de61bdb126bcdbd9d395ad1' 
  AND token = '5fVuJVrA6C6XbNQ5YW0FsLrCCoQArQgRkj4VmGx1ksE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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